When I was serving in the US Navy we quit using Rubidium standards
for Submarine radio and started using Cesium standards.
We also had a pair of Cesium standards that were used for timing in
the navigation system.
I was told that the change was due to the Cesium had better long term
stability than the Rubidium standard.
Every three months we calculated the drift rate for both of the
navigation standards. We used LORAN for the reference.
Radio sent their standards to the submarine tender calibration lab to
be calibrated.
The problem that we had with the Cesium standards was tube life.
The tube can be very expensive.
73
Glenn
WB4UIV
At 12:19 AM 5/9/2009, you wrote:
OK, dumb question time.
I have a few GPSDO's (Trimble T-Bolt, Z3801A, TrueTime & HB units).
How much better can the Cesium be than any of those ??
73, Dick, W1KSZ
-----Original Message-----
>From: [email protected]
>Sent: May 8, 2009 12:53 PM
>To: [email protected]
>Subject: Re: [time-nuts] fleabay cesium
>
>The cesium is from the same source as the two HP 5062. A friend of
mine is selling them for me. I am in the process of cleaning house
and that is also where the FTS1200 came from. More things are to
come. I think this one is a later model because it has the newer
power supply board and the DC cesium oven controller. I think it is
the one unit. It should say in the description. I know I tested it,
also measured beam current with the LF test. It des not have the
two lights but during test they where installed and the pictures
are of the actual unit. If you want to know any thing else please
let me know.? Bert Kehren Miami
>
>
>-----Original Message-----
>From: Brian Kirby <[email protected]>
>To: precise time and frequency measurement <[email protected]>
>Sent: Fri, 8 May 2009 12:06 am
>Subject: [time-nuts] fleabay cesium
>
>
>seems to be a decent price cesium for sale ($600 starting HP5061A)?
>?
>http://cgi.ebay.com/HP-5061A-Cesium-Beam-Frequency-Standard-WORKING
_W0QQitemZ250415440530QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3a4dec6292&_trksid=p3286.c0.m14&_trkparms=72%3A1205|66%3A4|65%3A12|39%3A1|240%3A1318|301%3A1|293%3A1|294%3A200?
>?
>nobody has bid and 21 hours left...?
>?
>just a heads up - I know nothing about the unit or the dealer...?
>?
>Brian KD4FM?
>?
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